2019

1. Explanatory IRT tutorial with the TAM package in R

   In this post, we’ll go through the basics of running latent regression models in TAM. In essence, these are IRT models with covariates. These are especially useful for expanding on inferences or measurement claims made with the Rasch model. While not particularly conceptually difficult, there are a number of moving parts that I hope this will...

   March 15 - 13 minute read

2018

1. Correlation Doesn't Even Imply Correlation, Necessarily

   There’s a problem with the oft-heard-in-intro-stats-courses phrase “correlation does not imply causation.” I think it gives statistics students the wrong impression, if not carefully flushed out, about the differences between random variables, estimates, and estimands. The phrase also provides a perfect opportunity to induce some thoughts abo...

   September 12 - 3 minute read